准噶尔盆地吉木萨尔凹陷陆相页岩油地质特征与聚集机理
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摘要
综合利用岩心、测井、烃源岩热解、铸体薄片、场发射扫描电镜、激光共聚焦显微镜与高压压汞等分析测试的结果,对准噶尔盆地吉木萨尔凹陷芦草沟组陆相页岩油地质特征与聚集机理进行了研究。结果表明:吉木萨尔凹陷咸化湖盆型沉积地层富含有机质,是烃源岩层也是储层,页岩油藏具有"源储一体"的地质特征,存在粉砂岩类与泥岩类和白云岩类与泥岩类两类岩性组合类型。芦草沟组大面积整体含油、"甜点"富集且原油成熟度较低。页岩油赋存岩石的润湿性为亲油性,生烃增压是页岩油运聚的主要动力。微纳米孔喉、层理缝与构造裂缝形成页岩油的有利储集空间与渗流通道。页岩油整体为源内或近源聚集,并以游离态和吸附态赋存于芦草沟组"甜点"段与泥页岩层段中。
We studied the geological characteristics and accumulation mechanism of continental shale oil in Jimusaer sag,based on the data collected from core and casting thin section observation,well log,Rock-Eval pyrolysis,field emission scanning electron microscopy( FE-SEM),laser-scanning confocal microscopy and high pressure mercury injection. The results show that the Lucaogou Formation in Jimusaer sag is originated from the organic-rich sediments in saline lacustrine basins,which serve as both source rocks and reservoirs,and the shale oil reservoirs herein are geologically characterized by "indigenous accumulation". There are two types of lithologic associations: one is siltstone-mudstone,and the other is dolomite-mudstone. Oil is pervasive in the Lucaogou Formation,enriches in "sweet spots",and has lower maturity. The shale oil reservoir is oil-wet,and pressurization caused by hydrocarbon generation is the main driving force for its shale oil migration and accumulation. The micro-and nano-pore throats,bedding-parallel fractures and tectonic fractures are favorable reservoir space and vadose channels for the Lucaogou shale oil in Jimusaer sag. The shale oil accumulates within or close to the source rocks as a whole,and occurs in the "sweet spots"and shale intervals in free or absorbed phases.
We studied the geological characteristics and accumulation mechanism of continental shale oil in Jimusaer sag,based on the data collected from core and casting thin section observation,well log,Rock-Eval pyrolysis,field emission scanning electron microscopy( FE-SEM),laser-scanning confocal microscopy and high pressure mercury injection. The results show that the Lucaogou Formation in Jimusaer sag is originated from the organic-rich sediments in saline lacustrine basins,which serve as both source rocks and reservoirs,and the shale oil reservoirs herein are geologically characterized by "indigenous accumulation". There are two types of lithologic associations: one is siltstone-mudstone,and the other is dolomite-mudstone. Oil is pervasive in the Lucaogou Formation,enriches in "sweet spots",and has lower maturity. The shale oil reservoir is oil-wet,and pressurization caused by hydrocarbon generation is the main driving force for its shale oil migration and accumulation. The micro-and nano-pore throats,bedding-parallel fractures and tectonic fractures are favorable reservoir space and vadose channels for the Lucaogou shale oil in Jimusaer sag. The shale oil accumulates within or close to the source rocks as a whole,and occurs in the "sweet spots"and shale intervals in free or absorbed phases.
引文
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[7]宋永,周路,郭旭光,等.准噶尔盆地吉木萨尔凹陷芦草沟组湖相云质致密油储层特征与分布规律[J].岩石学报,2017,33(4):1159-1170.Song Yong,Zhou Lu,Guo Xuguang,et al. Characteristics and occurrence of lacustrine dolomitic tight-oil reservoir in the Middle Permian Lucaogou Formation,Jimusaer sag,southeastern Junggar Basin[J].Acta Petrologica Sinica,2017,33(4):1159-1170.
[8]李红南,毛新军,胡广文,等.准噶尔盆地吉木萨尔凹陷芦草沟组致密油储层特征及产能预测研究[J].石油天然气学报,2014,36(10):40-44.Li Hongnan,Mao Xinjun,Hu Guangwen,et al. Characteristics and Productivity Prediction of Tight Reservoirs in Lucaogou Formation of Jimusa’er Sag in Junggar Basin[J]. Journal of Oil and Gas Technology,2014,36(10):40-44.
[9]邱振,卢斌,施振生,等.准噶尔盆地吉木萨尔凹陷芦草沟组页岩油滞留聚集机理及资源潜力探讨[J].天然气地球科学,2016,27(10):1817-1827.Qiu Zhen,Lu Bin,Shi Zhensheng,et al. Residual accumulation and resource assessment of shale oil from the Permian Lucaogou Formation in Jimusar Sag[J]. Natural Gas Geoscience,2016,27(10):1817-1827.
[10] Zheng M,Li J,Wu X,et al. Physical modeling of oil charging in tight reservoirs:A case study of Permian Lucaogou Formation in Jimsar Sag,Junggar Basin,NW China[J]. Petroleum Exploration and Development. 2016,43(2):241-250.
[11]邱振,施振生,董大忠,等.致密油源储特征与聚集机理———以准噶尔盆地吉木萨尔凹陷二叠系芦草沟组为例[J].石油勘探与开发,2016,43(6):928-939.Qiu Zhen,Shi Zhensheng,Dong Dazhong,et al. Geological characteristics of source rock and reservoir of tight oil and its accumulation mechanism:A case study of Permian Lucaogou Formation in Jimusar sag,Junggar Basin[J]. Petroleum Exploration and Development,2016,43(6):928-939.
[12]高岗,向宝力,王轩,等.准噶尔盆地吉木萨尔凹陷芦草沟组湖相混合沉积中缝合线发育与有机质富集研究[J].天然气地球科学,2016,27(11):1963-1969.Gao Gang,Xiang Baoli,Wang Xuan,et al. Stylolite occurrence and organic matter enrichment of the mixed sediments in the Lucaogou Formation of the Jimusaer Sag in Junggar Basin[J]. Natural Gas Geoscience,2016,27(11):1963-1969.
[13] Cao Z,Liu G,Zhan H,et al. Geological control factors of micro oil distribution in tight reservoirs[J]. Marine and Petroleum Geology.2016,77:1193-1205.
[14] Wang X,Sun L,Zhu R,et al. Application of charging effects in evaluating storage space of tight reservoirs:A case study from Permian Lucaogou Formation in Jimusar sag,Junggar Basin,NW China[J]. Petroleum Exploration and Development. 2015,42(4):516-524.
[15]葛云锦,任来义,贺永红,等.鄂尔多斯盆地富县———甘泉地区三叠系延长组7油层组致密油富集主控因素[J].石油与天然气地质,2018,39(6):1190-1200.Ge Yunjin,Ren Laiyi,He Yonghong,et al. Main factors controlling the tight oil enrichment in the 7th oil layer group of the Triassic Yanchang Formation in Fuxian-Ganquan area,Ordos Basin[J]. Oil&Gas Geology,2018,39(6):1190-1200.
[16] Cao Z,Liu G,Kong Y,et al. Lacustrine tight oil accumulation characteristics:Permian Lucaogou Formation in Jimusaer Sag,Junggar Basin[J]. International Journal of Coal Geology. 2016,153:37-51.
[17] Bao Haijuan,He Wenjun,Fei Liying,et al. 2015. The characteristics and main controlling factors of tight oil reservoir in Jimsar Sag of Junggar Basin[J]. Acta Geologica Sinica(English Edition),87(supp.):182-183.
[18] Zhang C,Zhu D,Luo Q,et al. Major factors controlling fracture development in the Middle Permian Lucaogou Formation tight oil reservoir,Junggar Basin,NW China[J]. Journal of Asian Earth Sciences,2017,146:279-295.
[19]张金川,林腊梅,李玉喜,等.页岩油分类与评价[J].地学前缘,2012,19(5):322-331.Zhang Jinchuan,Lin Lamei,Li Yuxi,et al. Classification and evaluation of shale oil[J]. Earth Science Frontiers,2012,19(5):322-331.
[2]郑孟林,田爱军,杨彤远,等.准噶尔盆地东部地区构造演化与油气聚集[J].石油与天然气地质,2018,39(5):907-917.Zheng menglin,Tian Aijun,Yang Tongyuan,et al. Structural evolution and hydrocarbon accumulation in the eastern Junggar Basin[J]. Oil&Gas Geology,2018,39(5):907-917.
[3]匡立春,唐勇,雷德文,等.准噶尔盆地二叠系咸化湖相云质岩致密油形成条件与勘探潜力[J].石油勘探与开发,2012,39(6):657-667.Kuang Lichun,Tang Yong,Lei Dewen,et al. Formation conditions and exploration potential of tight oil in the Permian saline lacustrine dolomitic rock,Junggar Basin,NW China[J]. Petroleum Exploration and Development,2012,39(6):657-667.
[4] Qiu Z,Tao H,Zou C,et al. Lithofacies and organic geochemistry of the Middle Permian Lucaogou Formation in the Jimusar Sag of the Junggar Basin,NW China[J]. Journal of Petroleum Science and Engineering. 2016,140:97-107.
[5]匡立春,高岗,向宝力,等.吉木萨尔凹陷芦草沟组有效源岩有机碳含量下限分析[J].石油实验地质,2014,36(2):224-229.Kuang Lichun,Gao Gang,Xiang Baoli,et al. Lowest limit of organic carbon content in effective source rocks from Lucaogou Formation in Jimusar Sag[J]. Petroleum Geology&Experiment,2014,36(2):224-229.
[6]匡立春,胡文瑄,王绪龙,等.吉木萨尔凹陷芦草沟组致密油储层初步研究:岩性与孔隙特征分析[J].高校地质学报,2013,19(3),529-535.Kuang Lichun,Hu Wenxuan,Wang Xulong,et al. Research of the tight oil reservoir in the Lucaogou Formation in Jimusar Sag:Analysis of lithology and porosity characteristics[J]. Geological Journal of China Universities,2013,19(3),529-535.
[7]宋永,周路,郭旭光,等.准噶尔盆地吉木萨尔凹陷芦草沟组湖相云质致密油储层特征与分布规律[J].岩石学报,2017,33(4):1159-1170.Song Yong,Zhou Lu,Guo Xuguang,et al. Characteristics and occurrence of lacustrine dolomitic tight-oil reservoir in the Middle Permian Lucaogou Formation,Jimusaer sag,southeastern Junggar Basin[J].Acta Petrologica Sinica,2017,33(4):1159-1170.
[8]李红南,毛新军,胡广文,等.准噶尔盆地吉木萨尔凹陷芦草沟组致密油储层特征及产能预测研究[J].石油天然气学报,2014,36(10):40-44.Li Hongnan,Mao Xinjun,Hu Guangwen,et al. Characteristics and Productivity Prediction of Tight Reservoirs in Lucaogou Formation of Jimusa’er Sag in Junggar Basin[J]. Journal of Oil and Gas Technology,2014,36(10):40-44.
[9]邱振,卢斌,施振生,等.准噶尔盆地吉木萨尔凹陷芦草沟组页岩油滞留聚集机理及资源潜力探讨[J].天然气地球科学,2016,27(10):1817-1827.Qiu Zhen,Lu Bin,Shi Zhensheng,et al. Residual accumulation and resource assessment of shale oil from the Permian Lucaogou Formation in Jimusar Sag[J]. Natural Gas Geoscience,2016,27(10):1817-1827.
[10] Zheng M,Li J,Wu X,et al. Physical modeling of oil charging in tight reservoirs:A case study of Permian Lucaogou Formation in Jimsar Sag,Junggar Basin,NW China[J]. Petroleum Exploration and Development. 2016,43(2):241-250.
[11]邱振,施振生,董大忠,等.致密油源储特征与聚集机理———以准噶尔盆地吉木萨尔凹陷二叠系芦草沟组为例[J].石油勘探与开发,2016,43(6):928-939.Qiu Zhen,Shi Zhensheng,Dong Dazhong,et al. Geological characteristics of source rock and reservoir of tight oil and its accumulation mechanism:A case study of Permian Lucaogou Formation in Jimusar sag,Junggar Basin[J]. Petroleum Exploration and Development,2016,43(6):928-939.
[12]高岗,向宝力,王轩,等.准噶尔盆地吉木萨尔凹陷芦草沟组湖相混合沉积中缝合线发育与有机质富集研究[J].天然气地球科学,2016,27(11):1963-1969.Gao Gang,Xiang Baoli,Wang Xuan,et al. Stylolite occurrence and organic matter enrichment of the mixed sediments in the Lucaogou Formation of the Jimusaer Sag in Junggar Basin[J]. Natural Gas Geoscience,2016,27(11):1963-1969.
[13] Cao Z,Liu G,Zhan H,et al. Geological control factors of micro oil distribution in tight reservoirs[J]. Marine and Petroleum Geology.2016,77:1193-1205.
[14] Wang X,Sun L,Zhu R,et al. Application of charging effects in evaluating storage space of tight reservoirs:A case study from Permian Lucaogou Formation in Jimusar sag,Junggar Basin,NW China[J]. Petroleum Exploration and Development. 2015,42(4):516-524.
[15]葛云锦,任来义,贺永红,等.鄂尔多斯盆地富县———甘泉地区三叠系延长组7油层组致密油富集主控因素[J].石油与天然气地质,2018,39(6):1190-1200.Ge Yunjin,Ren Laiyi,He Yonghong,et al. Main factors controlling the tight oil enrichment in the 7th oil layer group of the Triassic Yanchang Formation in Fuxian-Ganquan area,Ordos Basin[J]. Oil&Gas Geology,2018,39(6):1190-1200.
[16] Cao Z,Liu G,Kong Y,et al. Lacustrine tight oil accumulation characteristics:Permian Lucaogou Formation in Jimusaer Sag,Junggar Basin[J]. International Journal of Coal Geology. 2016,153:37-51.
[17] Bao Haijuan,He Wenjun,Fei Liying,et al. 2015. The characteristics and main controlling factors of tight oil reservoir in Jimsar Sag of Junggar Basin[J]. Acta Geologica Sinica(English Edition),87(supp.):182-183.
[18] Zhang C,Zhu D,Luo Q,et al. Major factors controlling fracture development in the Middle Permian Lucaogou Formation tight oil reservoir,Junggar Basin,NW China[J]. Journal of Asian Earth Sciences,2017,146:279-295.
[19]张金川,林腊梅,李玉喜,等.页岩油分类与评价[J].地学前缘,2012,19(5):322-331.Zhang Jinchuan,Lin Lamei,Li Yuxi,et al. Classification and evaluation of shale oil[J]. Earth Science Frontiers,2012,19(5):322-331.